PIC16F818-I/P Microchip Technology, PIC16F818-I/P Datasheet - Page 432

• Manufacturer Part Number: PIC16F818-I/P
• Description: IC MCU FLASH 1KX14 18-DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F818-I/P

• Program Memory Type: FLASH
• Program Memory Size: 1.75KB (1K x 14)
• Package / Case: 18-DIP (0.300", 7.62mm)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 16
• Eeprom Size: 128 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: I2C/SPI/SSP
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 16
• Number Of Timers: 3
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DM163014
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 5-ch x 10-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: ACICE0202 - ADAPTER MPLABICE 18P 300 MILAC164010 - MODULE SKT PROMATEII DIP/SOIC
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PICmicro MID-RANGE MCU FAMILY
23.7
DS31023A-page 23-10
A/D Conversions
Example 23-3
lower four PORTG pins are configured as analog inputs. The analog references (V
V
clock is F
Clearing the GO/DONE bit during a conversion will abort the current conversion. The A/D result
register pair will NOT be updated with the partially completed A/D conversion sample. That is,
the ADRESH:ADRESL registers will continue to contain the value of the last completed conver-
sion (or the last value written to the ADRESH:ADRESL registers). After the A/D conversion is
aborted, a 2T
sition on the selected channel is automatically started.
Example 23-3:
Figure 23-4: A/D Conversion T
;
;
;
;
REF
Note:
Ensure that the required sampling time for the selected input
channel has elapsed. Then the conversion may be started.
-) are the device AV
BSF
CLRF
BSF
BCF
MOVLW
MOVWF
BCF
BSF
BSF
BSF
Tcy - T
:
:
:
Set GO bit
RC
Holding capacitor is disconnected from analog input (typically 100 ns)
. The conversion is performed on the AN0 pin (channel 0).
The GO/DONE bit should NOT be set in the same instruction that turns on the A/D,
due to the required acquisition time requirement.
AD
AD
shows how to perform an A/D conversion for the PIC17C756. The PORTF and
STATUS, RP0
ADCON1
PIE1, ADIE
STATUS, RP0
0xC1
ADCON0
PIR1, ADIF
INTCON, PEIE
INTCON, GIE
ADCON0, GO
Conversion Starts
wait is required before the next acquisition is started. After this 2T
T
A/D Conversion
AD
b9
1 T
b8
AD
DD
2 T
Preliminary
and AV
b7
AD
AD
Next Q4: ADRES is loaded,
3 T
Cycles
; Select Bank1
; Configure A/D inputs,
;
; Enable A/D interrupts
; Select Bank0
; RC Clock, A/D is on, Channel 0 is selected
;
; Clear A/D interrupt flag bit
; Enable peripheral interrupts
; Enable all interrupts
; Start A/D Conversion
; The ADIF bit will be set and the GO/DONE
; bit is cleared upon completion of the
;
SS
AD
b6
. The A/D interrupt is enabled, and the A/D conversion
4 T
result is left justified
A/D Conversion.
GO bit is cleared,
ADIF bit is set,
holding capacitor is connected to analog input.
AD
b5
5 T
b4
AD
6 T
AD
b3
7 T
AD
b2
1997 Microchip Technology Inc.
8
T
b1
AD
9 T
AD
b0
AD
10
wait, acqui-
T
AD
REF
b0
11
+ and